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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f9918edfe91c9ea556c03cefde92ddf711a77d11c81f81339fc67b88c492ff' 
  AND token = 'dILlP99DvFPey1vt6aDKbL8TTxnxXkD4XuBT+cGkbu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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