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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aedb2735e9806aeb8316475fbbdfdbdc64ac18a32c4e35756655fd89724cc8e' 
  AND token = '7bm+zgIfKmTjuaim6ck4yuhlJmoTjNp8OLQN0xEnXMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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