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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526495447e21fabdf5a9120244bf01c340e6c1e4f07bf85e189c1c012dafe678' 
  AND token = 'nl0klDGduA4M0KB1KRoNo1fqHFQZHU3bqQAVxt/KqXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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