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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33b2030f4ed9c9ec978aeb6c2f84510c5b86a3ddc0d24d39376689a16f94b37' 
  AND token = 'nAXpUxoH3FYseyMtQ45xB28rTcLM3fXv20sz+PztEac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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