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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04dfb09f37c6c11c7c013ee2d559378e69b076bf76d64c044ee04389a4ad2c7' 
  AND token = 'vYM2T97rYqYbH/RS0h9THKusOmOvrN/+rnvjeDX06vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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