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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608153700c5bcd1d316113e88052e14b5274d3a32173dab453603b12c6e1566b' 
  AND token = 'c3Bl7RraD/0S9AQMWbBULv7ItCVdZCWaW9EowD+kyEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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