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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2d28c2843aad393501391f2bf1fbb80b8e9a4f1af71b2273e5841ff4f68f4b' 
  AND token = 'UvxjLwfU+1oNl7u2tgObxlMZc50SoIdQHCGopcBiPpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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