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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8130e94970931626d5348b932a085921ff2d2a4b3e92461fb7695143d271b14' 
  AND token = 'VlUqMIM9toBdl8EufQqwdg8Y8OeW13h+gsQam+QyYag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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