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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9c8e2fac278dcbb2b3e9f8c304722cd3d62e9bc219f65007dcdeaac70dbd2d' 
  AND token = 'gS8bjo0+H8c3ns/yE5Hz/toJ5j9wpSOeDsYCqYD+0QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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