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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5acbc11bbcab1b1d7f72a6c7e0e24431c8c0fc6ce3db5a06504d04194558b6cd' 
  AND token = 'ZqLaz9o+4RE4Kzj8HNrBPvzJKsvzsTKXI+IlTcZn5PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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