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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4494c27a092a6932464d8d3e36f56dc183f8d6f9af7725152e5204ae3947429e' 
  AND token = '27x+tU8Po/oEMQw8laL36ac+lpaOYGVpNPiyhjtkxGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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