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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41d0898b3e03a73cccd1f1882e8e17194615b1c0e397cd52c6183d0a18ccc60c' 
  AND token = 'j/j5p1oJKcGR45r8C3wo5oBmuWP/TG8FMqo+rzPbrko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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