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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034692d401bc995c40792b47fe52d517e85f08f1f44ec5e50f6cfdc7f00e41a2' 
  AND token = 'ly7x/fqR09NFBgiH1/+1zpD2ZPFe99qEPA7K5xMbk20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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