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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd822481c3acca06eb8850c205d880bbad7ea8ca59592ff437e1aea8c489b3b6e' 
  AND token = '4uCx35IY9CjFFrXBU7WrsO3UKyX9UddI8cmadEHySys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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