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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d299180561a6b93b1973e2874b446eaeb7ea84d34b12441c99faedcb127e7e' 
  AND token = 'Mv8eyr3iHnnzyWMJpRfGOpSC90OhXAO7V9Lw1HU4GA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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