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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2965af9b7f89ddf4e84126bf4eb8455ab5f5e93152db193c6f64ee6ded43ac' 
  AND token = 'lM1BwA9GRXGy8P6t657+YerGo7mHCFNs6ecZ6uA6q58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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