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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877db274a2ad4f86458cf9a63c412f40d2be67f5c4a7ab6914854b492dabd772' 
  AND token = 'XluaFov4o5YZT314YGegkqV8kNaEC30PXRw7ps3wyK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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