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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d28e3867bf65d0c512792e912721b1a71b1103255a796ebea56b469b53e521' 
  AND token = '7tkUNiXSn797ZmzGnmYGxHcdrIZLKaikbv5Y8SxbNTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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