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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb5c73cf8d1a1fb5cbbba8fa1834b810a3ac4eb510c47ff82fed6ce9b74432e' 
  AND token = 'SCU3jaQ2LsBK0IbD4AxbSTf+9QiAGPd9g+6QliIW5B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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