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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56aa7fa7241f7a673ccdc9bf8ac08426f8bd2a7e8d8e587c97f9924da611bb71' 
  AND token = 'ZQX0Sg17iuyIycx89Z7LhIOHAGXlbzMqK167Gj1WmY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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