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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab43ab4c41a38ec8a41d23f3103c457b1b0df54c35eae5804be38cfe97156f8' 
  AND token = 'NAOLapWJp5uO5Eq1/2IjiRr7Yye3VILSqpiD3/xd788=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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