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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1fa48904f5d783dbbeea991858715a73cedcb03e6cb8de14c82ad3209075063' 
  AND token = '0NHDXWQy0Tj4+UGWpbNO/ss7Af+sKkn8CnXzP98QCrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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