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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3667f8f8b022cd3db8db5e0d6d2c5f855b0d809d4e3afaa0fc11edfe313933b' 
  AND token = 'dbOlJBUJ3bDqC3iIZpIlDzSm8qwlrHEf72JZntuhCRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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