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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d7beef22ae58844ae40f12ab1a92ba2c7bfe43c8d458cf232ec07a7ad7559d' 
  AND token = 'hPus20scm8fA2v2TTJPz2aCmp8BmvMVubLnRxN9v/Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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