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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b8b880134f730fc4dd58876b8101519b3b31da758d13b86a7ccb25c4a497c7' 
  AND token = 'rTpe287Vixch3ObdIRTpdxEXo/p87Mq4LlcG8mgJ01M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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