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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67942e130da5d4eaa98dd2700596d26949b132b4c28879604cb8ea8a1b1f7d3' 
  AND token = 'oN83OwaBYhWvl9xF2Mmy/ZClLgf8X1oZnj3do0yiEeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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