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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b34fcf2173d4d937ed8cfbe7e74db7ee4917fb8dcd54ab2ee1bed77da25f38' 
  AND token = 'nCQijkMt6my41Ar2M6qYFJl5idWyMaQY6SHLuPUn5m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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