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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11866e64de303b9c8f41c42c718b7d609577f322daddf404afc4d469233b19f3' 
  AND token = 'rvxnRF0tKaCLZ8TRqHLvvArnq7LTHOfsOjSy2DJry+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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