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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2dbb0104fb5c9fa263087ada42102124d111a29e9b5f1f17cd06d17a36c9a3' 
  AND token = 'aaNU/xoTvTMWyf8TSVJ8Aws2aiagRMI4uRm4Jtb7r8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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