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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8034023ba8d433ef4c1b3f51248425e10ec130cae38f01bb6b88804367ba38e1' 
  AND token = 'mqWTg52sXqA4JJFM5zV1H3n6WsyjwWRgWGU2PwMn7tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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