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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19eb5605dae1e31d0df76e561129de0056371acd59c75d45e901ce58f1668d18' 
  AND token = '73m2z8k0dkrtmwjSieB+D0SYJL+dB6waeArhImY3hl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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