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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '149cd7ff9ee351677a7b2b24c5b88d709ba4a031e89367a1a9c34cb95689a571' 
  AND token = 'k/7twwyYNzqYV8ntufZNCQtUT30yz8PcdkYPO7Mt53c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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