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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a4e4f1882c42d2967cfc5e182590ce2a0ced8e1fc15e5db819f6b5685a698a8' 
  AND token = 'ZGMrkvtQ7gUtEnrL9cVnj62UvOPKykt6+XKFax9SmsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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