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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc3f00452559580e5e7d2cf0b905f1b1cf2e16362b980ac7b6934e9a351ac63' 
  AND token = 'H61C0MmHqLi8N3AlxMI+anOJELgo0U327k4H9sTOVBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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