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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36100acd17afb3c59763df9772bc2da1b311255577e39101aa7add16f79db55' 
  AND token = 'euVplkAKCzj0PV6Z7ADgVogqi6bw0sBWh2Bj/Ux/JjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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