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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f11551c52519dbf83b5470f0afbb7c08dcfea5fd03437459d535cf53ab0342f' 
  AND token = 'UXoyhrskfFvP1FOq7/2C8YPh2RIsU0xvW6vTLKscT/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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