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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686427fd30da96e4fad9abf263a5529b0efa7d96aadf4932ec8d4782aca9936d' 
  AND token = 'c8qal1WmH/Mja5lKvtdMSInhrnQpIsz/ZHMlq5Z610Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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