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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ef46d74f7e9f6951036164ed96b854e8db5fc71e1efca77b3912b45f548fe57' 
  AND token = 'fGf8AcDHdmaJB9c5L/l7GKlmmIzrX9J5+eQNnkefLMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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