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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c7d7e04184dc9bed3f7f30606a69839a7a0a0520fd00663045545d643b1876' 
  AND token = '0tWwALd/AN+yrDlWRajheU9VXUtHFrq+B1pCcowvNbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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