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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458f5beab6380e92a4329836bbf923dc94f0940f887ca398a86bf9d5e33d8ef9' 
  AND token = 'bCg/89eJ1wm5nyZekaweBqoVyvqyKQM5hozG8BmP5S0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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