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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699c1cbdcae428bdf54a274e15daed5147d0f8d056e4ccfefd54ea56d1a335bd' 
  AND token = 'ExlLv9hfOdB4jXjY4wQIIx0dsr6P8DkW+7L6xCSgnSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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