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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf02a9fc80df59af001a4bcb4cdb4d60e1cd92a886fe9a96b6b8c775763c4aa8' 
  AND token = 'wNZu/MO3VDQPkZ/bT0IBBsvOimQpMH/kyf6v+szMVEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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