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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3557fb346c9c1381f5a02c144713695f9539ac743c5c28a4352a643400bbcbd1' 
  AND token = 'ZiRi6Ck9rs6c4GWPlXbpcpIypchS1QAH6Kz7ffRR+Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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