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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5674eb670335d834495656e460b7fd399a8b89f79d5a1aa0f6755c3613ab86cd' 
  AND token = 'Z2Utv2/rWe5hNMlqz8fW0ydiI7E8lG6MB662HVxgDCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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