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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345614ab64c457248cafe4cd07458bdb27708de9c12ab5975fcd627a29593e2a' 
  AND token = '0Rw4BZUHVk0K4FejJoNtIXdGG0aKRsW4D/lruWUynp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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