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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6bac06f8704d9efcce99c77d6fbd00afee120932a9f7f6dd65b35b3899d6bf' 
  AND token = 'meoo6CgYCtoW23OdaLX1pD+toER6feVnFk3sX7vHPuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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