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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced61a34ad06aecfb53ffa37570c329aab636a6bcba2cb8ba81aace54a6248b7' 
  AND token = '4VFOjQ59xme5pSAVMIGcOF/QO3yNOIhRCitrkwJKZQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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