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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be40ab692ae195ca1f355d71656259f9a2bd458cd1a73cd1786074836b49bb23' 
  AND token = 'amrnOq/eJH6bUq3DAU4j+TvjO44+D/uQRlfzZafyexA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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