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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de690c0d017f03461a231e83c854ad870e243c0e3858438ae2ac8b0c76a29e1d' 
  AND token = 'IHzv9k9PS9tEpPCmB3p8VLZiEeZCRsoua3CYNGXKg2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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