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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95730cbdcfb33ac07db16cb58c1fff91919d5987160576e76e50688d13113d86' 
  AND token = 'huZvh3JB92zVmOxrkxKGT/Q5bLEI1Vje9b3YQz8dTS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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