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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67b4391d2de258b5b1aa2dfbd7528c5b17c4dc0efbed56f4770f618e727466d' 
  AND token = 'GjmjVswbCd3X8wCzDAEe2ayLloIF5JVgXkbf+Do4auU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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