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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e369b58922cde3329b88be0a741e67853a9b3991a982e3e3173abfd1cbabea5' 
  AND token = 'YdgwoUzo9JckZJqdsv8aJV63zrwmP4b6pefQOEOTmsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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