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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837011fb46f9c1c34f7e3d4ba5426585c154acf75060af765efdbc52fc38ffb4' 
  AND token = '1MQf8HSsxulEcGyvhExJn3Y3zR+qsZznCPDrXMbjvQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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