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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ee370cdbad9350ccd792bf4e83c17b15272ebe5e9260f178087d08fa816ae2' 
  AND token = '2ONXqCbAfGbZsSzk5WWfVnFVIjUWEr90ZA7aNOOevyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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