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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb336e709c659b7bcac7930a35e967b71dac98565492773567a9518f8279986' 
  AND token = 'ilW4xClbqfA2cWP7JyrtuA9RBjcmTrbsKoy1R7IneFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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