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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e679ee5de5bee9ab249f0c3235b560b01659c2fc852181d5fdbff17014639d4' 
  AND token = 'SJ4wIjuVMg7MTqJVKLbuPunwFljV9M2CySuQk1QIvpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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