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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee0eccd2e8e8b6a4a967d23361d1dee9a59481943d4c5aee48e18b44d917841' 
  AND token = 'PD9gm7THHVp4wTwNMxascA3Xhgr+0z/0VCQXf9zrkQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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