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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b79825fa7c567e40936a61528152a6a8f2ed8c2a8d99a7b425dc014682852fe7' 
  AND token = 'h8qyx88A3TQoxE1ignZ6/aJquPrFC7HN/QUjcDbm/O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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