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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8501fd1f2b0279cc800a52700ee9b000166c2283ec1bf2abdb71a9384d3c28' 
  AND token = 'h6VH7rSIluV6UTA34aYOA0opZGw0L0S47DiBj55yoAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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