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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8c37fc4cd8beb81e6c9b735dc5d4d105fcce4659131d1fb76f291f9fb39b9b' 
  AND token = 'mw97UbdST4KSzP1Lm/OSrFC9oonk1NfVsdAdGqtV2vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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