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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b75e4ab48bc9ec086d62147cef1dcf65a11779407fd0ea02022531051d7176e8' 
  AND token = '3GaTyc6dK92foEQRjAE3VjaysZy2UUbXtqGnlzOM7J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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