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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc53ad13a7fca56338b8a788b6e906cb1ecf1ee1a94b647f92ca657197f126c' 
  AND token = 'jeI/a/NDBCcsIEbMQZDvWdLe6ETiZYLxzx9UMaCUwOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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