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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf02a631f43315dc2dca521434a639cf0573cf923a86ae6e8dfd78fc90b562a' 
  AND token = 'WX84f1GWgYxlEyAw3qcNEE3x8vpWRsZTLf1WVbjH6rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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