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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c376b4082b38d4d1c7b9729e28e207832a8c3facdd9a10723bf6e0b40d423b93' 
  AND token = 'fANtI/hBsWzxQHFWa6RdcR93QNRSPJ9EzR9eAXbvk2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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