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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f39b1307acdd1b560e659e3e6e363695e7b0b30054db05eba3109e9e0f3b852b' 
  AND token = 'FUEx+LGWlzuWuNyyCGpbwzLvmu9lG/7nFboKjWWFp8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}