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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6102d1828da1e146219c1da6c674aa8e060bd6bbbb8f60b6d8c206c70f91598' 
  AND token = 'gpTEjX3hV8qDBPVaiaEfInj6uceket91TAv9LHqDztU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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