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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c8ee74076d4c3d5308d0c4af68fc9a53ce4593dcdae77c9e5097ec8683003e5' 
  AND token = 'HfyWcshzvJm8w5YW5dXqUyJvQ7hi6Eo0bAr3PV5N8Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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